Nitrification is a biological process for removing NH3from wastewater at NH4+. T

Question

Nitrification is a biological process for removing NH3from wastewater at NH4+. The first-order rate constant is given below, wherek1 is in day-1 and T is indegreeC. k1 =0.47e0.095(T ? 15degreeC) (a) If the initial concentration ofNH3 is 5.5mol/m3, how long will it take to reduce theconcentration to 0.38mol/m3 in the spring (T=20degreeC)? 1 days (b) How long will it take to reduce the concentration to0.38 in the winter(T=10degreeC)? 2 days (c) Using your answer to part (a), what is the rate ofO2 consumption? 3mol/m3

Explanation / Answer

Part 1: Equation: ln[a] = -kt + ln[a0] k = 0.47e0.095(T - 15°C), if t =20, then k = 0.47e0.095(20 - 15°C)= .225 day-1 ln[.38] = (-.225)(t) + ln(5.5) t = 11.9 days Part 2: k = 0.47e0.095(T - 15°C),if t = 10, then k = 0.47e0.095(10 -15°C) = .087 day-1ln[.38] = (-.087)(t) +ln(5.5) t = 30.7 days

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